| Rna interference mediated inhibition of respiratory syncytial virus (rsv) expression using short interfering nucleic acid (sina) -> Monitor Keywords |
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Rna interference mediated inhibition of respiratory syncytial virus (rsv) expression using short interfering nucleic acid (sina)Related Patent Categories: Drug, Bio-affecting And Body Treating Compositions, Designated Organic Active Ingredient Containing (doai), O-glycoside, , Nitrogen Containing Hetero Ring, Polynucleotide (e.g., Rna, Dna, Etc.)Rna interference mediated inhibition of respiratory syncytial virus (rsv) expression using short interfering nucleic acid (sina) description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060287267, Rna interference mediated inhibition of respiratory syncytial virus (rsv) expression using short interfering nucleic acid (sina). Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] This application is a continuation-in-part of U.S. patent application Ser. No. 11/369,108 filed Mar. 6, 2006, which is a continuation-in-part of U.S. patent application Ser. No. 11/299,254, filed Dec. 8, 2005, which is a continuation-in-part of U.S. patent application Ser. No. 11/234,730, filed Sep. 23, 2005, which is a continuation-in-part of U.S. patent application Ser. No. 11/205,646, filed Aug. 17, 2005, which is a continuation-in-part of U.S. patent application Ser. No. 11/098,303, filed Apr. 4, 2005, which is a continuation-in-part of U.S. patent application Ser. No. 10/923,536, filed Aug. 20, 2004, which is a continuation-in-part of International Patent Application No. PCT/US04/16390, filed May 24, 2004, which is a continuation-in-part of U.S. patent application Ser. No. 10/826,966, filed Apr. 16, 2004, which is continuation-in-part of U.S. patent application Ser. No. 10/757,803, filed Jan. 14, 2004, which is a continuation-in-part of U.S. patent application Ser. No. 10/720,448, filed Nov. 24, 2003, which is a continuation-in-part of U.S. patent application Ser. No. 10/693,059, filed Oct. 23, 2003, which is a continuation-in-part of U.S. patent application Ser. No. 10/444,853, filed May 23, 2003, which is a continuation-in-part of International Patent Application No. PCT/US03/05346, filed Feb. 20, 2003, and a continuation-in-part of International Patent Application No. PCT/US03/05028, filed Feb. 20, 2003, both of which claim the benefit of U.S. Provisional Application No. 60/358,580 filed Feb. 20, 2002, U.S. Provisional Application No. 60/363,124 filed Mar. 11, 2002, U.S. Provisional Application No. 60/386,782 filed Jun. 6, 2002, U.S. Provisional Application No. 60/406,784 filed Aug. 29, 2002, U.S. Provisional Application No. 60/408,378 filed Sep. 5, 2002, U.S. Provisional Application No. 60/409,293 filed Sep. 9, 2002, and U.S. Provisional Application No. 60/440,129 filed Jan. 15, 2003. This application is also a continuation-in-part of International Patent Application No. PCT/US04/13456, filed Apr. 30, 2004, which is a continuation-in-part of U.S. patent application Ser. No. 10/780,447, filed Feb. 13, 2004, which is a continuation-in-part of U.S. patent application Ser. No. 10/427,160, filed Apr. 30, 2003, which is a continuation-in-part of International Patent Application No. PCT/US02/15876 filed May 17, 2002, which claims the benefit of U.S. Provisional Application No. 60/292,217, filed May 18, 2001, U.S. Provisional Application No. 60/362,016, filed Mar. 6, 2002, U.S. Provisional Application No. 60/306,883, filed Jul. 20, 2001, and U.S. Provisional Application No. 60/311,865, filed Aug. 13, 2001. This application is also a continuation-in-part of U.S. patent application Ser. No. 10/727,780 filed Dec. 3, 2003. This application is also a continuation-in-part of International Patent Application No. PCT/US05/04270, filed Feb. 9, 2005 which claims the benefit of U.S. Provisional Application No. 60/543,480, filed Feb. 10, 2004. This application is also a continuation-in-part of U.S. patent application Ser. No. 11/353,630, filed Feb. 14, 2006, which claims the benefit of U.S. Provisional Patent Applcation No. 60/652,787 filed Feb. 14, 2005, U.S. Provisional Patent Application No. 60/678,531 filed May 6, 2005, U.S. Provisional Patent Application No. 60/703,946, filed Jul. 29, 2005, and U.S. Provisional Patent Application No. 60/737,024, filed Nov. 15, 2005. The instant application claims the benefit of all the listed applications, which are hereby incorporated by reference herein in their entireties, including the drawings. FIELD OF THE INVENTION [0002] The present invention relates to compounds, compositions, and methods for the study, diagnosis, and treatment of traits, diseases and conditions that respond to the modulation of respiratory syncytial virus (RSV) gene expression and/or activity. The present invention is also directed to compounds, compositions, and methods relating to traits, diseases and conditions that respond to the modulation of expression and/or activity of genes involved in respiratory syncytial virus (RSV) gene expression pathways or other cellular processes that mediate the maintenance or development of such traits, diseases and conditions. Specifically, the invention relates to double stranded nucleic acid molecules including small nucleic acid molecules, such as short interfering nucleic acid (siNA), short interfering RNA (siRNA), double-stranded RNA (dsRNA), micro-RNA (miRNA), and short hairpin RNA (shRNA) molecules capable of mediating RNA interference (RNAi) against respiratory syncytial virus (RSV) gene expression. Such small nucleic acid molecules are useful, for example, in providing compositions to prevent, inhibit, or reduce RSV infection, liver failure, hepatocellular carcinoma, cirrhosis, and/or other disease states associated with RSV infection in a subject or organism. BACKGROUND OF THE INVENTION [0003] The following is a discussion of relevant art pertaining to RNAi. The discussion is provided only for understanding of the invention that follows. The summary is not an admission that any of the work described below is prior art to the claimed invention. [0004] RNA interference refers to the process of sequence-specific post-transcriptional gene silencing in animals mediated by short interfering RNAs (siRNAs) (Zamore et al., 2000, Cell, 101, 25-33; Fire et al., 1998, Nature, 391, 806; Hamilton et al., 1999, Science, 286, 950-951; Lin et al., 1999, Nature, 402, 128-129; Sharp, 1999, Genes & Dev., 13:139-141; and Strauss, 1999, Science, 286, 886). The corresponding process in plants (Heifetz et al., International PCT Publication No. WO 99/61631) is commonly referred to as post-transcriptional gene silencing or RNA silencing and is also referred to as quelling in fungi. The process of post-transcriptional gene silencing is thought to be an evolutionarily-conserved cellular defense mechanism used to prevent the expression of foreign genes and is commonly shared by diverse flora and phyla (Fire et al., 1999, Trends Genet., 15, 358). Such protection from foreign gene expression may have evolved in response to the production of double-stranded RNAs (dsRNAs) derived from viral infection or from the random integration of transposon elements into a host genome via a cellular response that specifically destroys homologous single-stranded RNA or viral genomic RNA. The presence of dsRNA in cells triggers the RNAi response through a mechanism that has yet to be fully characterized. This mechanism appears to be different from other known mechanisms involving double stranded RNA-specific ribonucleases, such as the interferon response that results from dsRNA-mediated activation of protein kinase PKR and 2',5'-oligoadenylate synthetase resulting in non-specific cleavage of mRNA by ribonuclease L (see for example U.S. Pat. Nos. 6,107,094; 5,898,031; Clemens et al., 1997, J. Interferon & Cytokine Res., 17, 503-524; Adah et al., 2001, Curr. Med. Chem., 8, 1189). [0005] The presence of long dsRNAs in cells stimulates the activity of a ribonuclease III enzyme referred to as dicer (Bass, 2000, Cell, 101, 235; Zamore et al., 2000, Cell, 101, 25-33; Hammond et al., 2000, Nature, 404, 293). Dicer is involved in the processing of the dsRNA into short pieces of dsRNA known as short interfering RNAs (siRNAs) (Zamore et al., 2000, Cell, 101, 25-33; Bass, 2000, Cell, 101, 235; Berstein et al., 2001, Nature, 409, 363). Short interfering RNAs derived from dicer activity are typically about 21 to about 23 nucleotides in length and comprise about 19 base pair duplexes (Zamore et al., 2000, Cell, 101, 25-33; Elbashir et al., 2001, Genes Dev., 15, 188). Dicer has also been implicated in the excision of 21- and 22-nucleotide small temporal RNAs (stRNAs) from precursor RNA of conserved structure that are implicated in translational control (Hutvagner et al., 2001, Science, 293, 834). The RNAi response also features an endonuclease complex, commonly referred to as an RNA-induced silencing complex (RISC), which mediates cleavage of single-stranded RNA having sequence complementary to the antisense strand of the siRNA duplex. Cleavage of the target RNA takes place in the middle of the region complementary to the antisense strand of the siRNA duplex (Elbashir et al., 2001, Genes Dev., 15, 188). [0006] RNAi has been studied in a variety of systems. Fire et al., 1998, Nature, 391, 806, were the first to observe RNAi in C. elegans. Bahramian and Zarbl, 1999, Molecular and Cellular Biology, 19, 274-283 and Wianny and Goetz, 1999, Nature Cell Biol., 2, 70, describe RNAi mediated by dsRNA in mammalian systems. Hammond et al., 2000, Nature, 404, 293, describe RNAi in Drosophila cells transfected with dsRNA. Elbashir et al., 2001, Nature, 411, 494 and Tuschl et al., International PCT Publication No. WO 01/75164, describe RNAi induced by introduction of duplexes of synthetic 21-nucleotide RNAs in cultured mammalian cells including human embryonic kidney and HeLa cells. Recent work in Drosophila embryonic lysates (Elbashir et al., 2001, EMBO J., 20, 6877 and Tuschl et al., International PCT Publication No. WO 01/75164) has revealed certain requirements for siRNA length, structure, chemical composition, and sequence that are essential to mediate efficient RNAi activity. These studies have shown that 21-nucleotide siRNA duplexes are most active when containing 3'-terminal dinucleotide overhangs. Furthermore, complete substitution of one or both siRNA strands with 2'-deoxy (2'-H) or 2'-O-methyl nucleotides abolishes RNAi activity, whereas substitution of the 3'-terminal siRNA overhang nucleotides with 2'-deoxy nucleotides (2'-H) was shown to be tolerated. Single mismatch sequences in the center of the siRNA duplex were also shown to abolish RNAi activity. In addition, these studies also indicate that the position of the cleavage site in the target RNA is defined by the 5'-end of the siRNA guide sequence rather than the 3'-end of the guide sequence (Elbashir et al., 2001, EMBO J., 20, 6877). Other studies have indicated that a 5'-phosphate on the target-complementary strand of a siRNA duplex is required for siRNA activity and that ATP is utilized to maintain the 5'-phosphate moiety on the siRNA (Nykanen et al., 2001, Cell, 107, 309). [0007] Studies have shown that replacing the 3'-terminal nucleotide overhanging segments of a 21-mer siRNA duplex having two-nucleotide 3'-overhangs with deoxyribonucleotides does not have an adverse effect on RNAi activity. Replacing up to four nucleotides on each end of the siRNA with deoxyribonucleotides has been reported to be well tolerated, whereas complete substitution with deoxyribonucleotides results in no RNAi activity (Elbashir et al., 2001, EMBO J., 20, 6877 and Tuschl et al., International PCT Publication No. WO 01/75164). In addition, Elbashir et al., supra, also report that substitution of siRNA with 2'-O-methyl nucleotides completely abolishes RNAi activity. Li et al., International PCT Publication No. WO 00/44914, and Beach et al., International PCT Publication No. WO 01/68836 preliminarily suggest that siRNA may include modifications to either the phosphate-sugar backbone or the nucleoside to include at least one of a nitrogen or sulfur heteroatom, however, neither application postulates to what extent such modifications would be tolerated in siRNA molecules, nor provides any further guidance or examples of such modified siRNA. Kreutzer et al., Canadian Patent Application No. 2,359,180, also describe certain chemical modifications for use in dsRNA constructs in order to counteract activation of double-stranded RNA-dependent protein kinase PKR, specifically 2'-amino or 2'-O-methyl nucleotides, and nucleotides containing a 2'-O or 4'-C methylene bridge. However, Kreutzer et al. similarly fails to provide examples or guidance as to what extent these modifications would be tolerated in dsRNA molecules. [0008] Parrish et al., 2000, Molecular Cell, 6, 1077-1087, tested certain chemical modifications targeting the unc-22 gene in C. elegans using long (>25 nt) siRNA transcripts. The authors describe the introduction of thiophosphate residues into these siRNA transcripts by incorporating thiophosphate nucleotide analogs with T7 and T3 RNA polymerase and observed that RNAs with two phosphorothioate modified bases also had substantial decreases in effectiveness as RNAi. Further, Parrish et al. reported that phosphorothioate modification of more than two residues greatly destabilized the RNAs in vitro such that interference activities could not be assayed. Id. at 1081. The authors also tested certain modifications at the 2'-position of the nucleotide sugar in the long siRNA transcripts and found that substituting deoxynucleotides for ribonucleotides produced a substantial decrease in interference activity, especially in the case of Uridine to Thymidine and/or Cytidine to deoxy-Cytidine substitutions. Id. In addition, the authors tested certain base modifications, including substituting, in sense and antisense strands of the siRNA, 4-thiouracil, 5-bromouracil, 5-iodouracil, and 3-(aminoallyl)uracil for uracil, and inosine for guanosine. Whereas 4-thiouracil and 5-bromouracil substitution appeared to be tolerated, Parrish reported that inosine produced a substantial decrease in interference activity when incorporated in either strand. Parrish also reported that incorporation of 5-iodouracil and 3-(aminoallyl)uracil in the antisense strand resulted in a substantial decrease in RNAi activity as well. [0009] The use of longer dsRNA has been described. For example, Beach et al., International PCT Publication No. WO 01/68836, describes specific methods for attenuating gene expression using endogenously-derived dsRNA. Tuschl et al., International PCT Publication No. WO 01/75164, describe a Drosophila in vitro RNAi system and the use of specific siRNA molecules for certain functional genomic and certain therapeutic applications; although Tuschl, 2001, Chem. Biochem., 2, 239-245, doubts that RNAi can be used to cure genetic diseases or viral infection due to the danger of activating interferon response. Li et al., International PCT Publication No. WO 00/44914, describe the use of specific long (141 bp-488 bp) enzymatically synthesized or vector expressed dsRNAs for attenuating the expression of certain target genes. Zernicka-Goetz et al., International PCT Publication No. WO 01/36646, describe certain methods for inhibiting the expression of particular genes in mammalian cells using certain long (550 bp-714 bp), enzymatically synthesized or vector expressed dsRNA molecules. Fire et al., International PCT Publication No. WO 99/32619, describe particular methods for introducing certain long dsRNA molecules into cells for use in inhibiting gene expression in nematodes. Plaetinck et al., International PCT Publication No. WO 00/01846, describe certain methods for identifying specific genes responsible for conferring a particular phenotype in a cell using specific long dsRNA molecules. Mello et al., International PCT Publication No. WO 01/29058, describe the identification of specific genes involved in dsRNA-mediated RNAi. Pachuck et al., International PCT Publication No. WO 00/63364, describe certain long (at least 200 nucleotide) dsRNA constructs. Deschamps Depaillette et al., International PCT Publication No. WO 99/07409, describe specific compositions consisting of particular dsRNA molecules combined with certain anti-viral agents. Waterhouse et al, International PCT Publication No. 99/53050 and 1998, PNAS, 95, 13959-13964, describe certain methods for decreasing the phenotypic expression of a nucleic acid in plant cells using certain dsRNAs. Driscoll et al, International PCT Publication No. WO 01/49844, describe specific DNA expression constructs for use in facilitating gene silencing in targeted organisms. [0010] Others have reported on various RNAi and gene-silencing systems. For example, Parrish et al, 2000, Molecular Cell, 6, 1077-1087, describe specific chemically-modified dsRNA constructs targeting the unc-22 gene of C. elegans. Grossniklaus, International PCT Publication No. WO 01/38551, describes certain methods for regulating polycomb gene expression in plants using certain dsRNAs. Churikov et al, International PCT Publication No. WO 01/42443, describe certain methods for modifying genetic characteristics of an organism using certain dsRNAs. Cogoni et al, International PCT Publication No. WO 01/53475, describe certain methods for isolating a Neurospora silencing gene and uses thereof. Reed et al., International PCT Publication No. WO 01/68836, describe certain methods for gene silencing in plants. Honer et al., International PCT Publication No. WO 01/70944, describe certain methods of drug screening using transgenic nematodes as Parkinson's Disease models using certain dsRNAs. Deak et al., International PCT Publication No. WO 01/72774, describe certain Drosophila-derived gene products that may be related to RNAi in Drosophila. Arndt et al., International PCT Publication No. WO 01/92513 describe certain methods for mediating gene suppression by using factors that enhance RNAi. Tuschl et al., International PCT Publication No. WO 02/44321, describe certain synthetic siRNA constructs. Pachuk et al., International PCT Publication No. WO 00/63364, and Satishchandran et al., International PCT Publication No. WO 01/04313, describe certain methods and compositions for inhibiting the function of certain polynucleotide sequences using certain long (over 250 bp), vector expressed dsRNAs. Echeverri et al., International PCT Publication No. WO 02/38805, describe certain C. elegans genes identified via RNAi. Kreutzer et al., International PCT Publications Nos. WO 02/055692, WO 02/055693, and EP 1144623 B1 describes certain methods for inhibiting gene expression using dsRNA. Graham et al., International PCT Publications Nos. WO 99/49029 and WO 01/70949, and AU 4037501 describe certain vector expressed siRNA molecules. Fire et al., U.S. Pat. No. 6,506,559, describe certain methods for inhibiting gene expression in vitro using certain long dsRNA (299 bp-1033 bp) constructs that mediate RNAi. Martinez et al., 2002, Cell, 110, 563-574, describe certain single stranded siRNA constructs, including certain 5'-phosphorylated single stranded siRNAs that mediate RNA interference in Hela cells. Harborth et al., 2003, Antisense & Nucleic Acid Drug Development, 13, 83-105, describe certain chemically and structurally modified siRNA molecules. Chiu and Rana, 2003, RNA, 9, 1034-1048, describe certain chemically and structurally modified siRNA molecules. Woolf et al., International PCT Publication Nos. WO 03/064626 and WO 03/064625 describe certain chemically modified dsRNA constructs. Hornung et al., 2005, Nature Medicine, 11, 263-270, describe the sequence-specific potent induction of IFN-alpha by short interfering RNA in plasmacytoid dendritic cells through TLR7. Judge et al., 2005, Nature Biotechnology, Published online: 20 Mar. 2005, describe the sequence-dependent stimulation of the mammalian innate immune response by synthetic siRNA. Yuki et al., International PCT Publication Nos. WO 05/049821 and WO 04/048566, describe certain methods for designing short interfering RNA sequences and certain short interfering RNA sequences with optimized activity. Saigo et al., US Patent Application Publication No. US20040539332, describe certain methods of designing oligo- or polynucleotide sequences, including short interfering RNA sequences, for achieving RNA interference. Tei et al., International PCT Publication No. WO 03/044188, describe certain methods for inhibiting expression of a target gene, which comprises transfecting a cell, tissue, or individual organism with a double-stranded polynucleotide comprising DNA and RNA having a substantially identical nucleotide sequence with at least a partial nucleotide sequence of the target gene. [0011] McSwiggen et al., WO 03/070918 describe double stranded nucleic acid molecules, including short interfering nucleic acids, targeting RSV and conserved sequences within the RSV genome. [0012] Bushman et al., US 2003/0203868 describe the inhibition of certain pathogens, including RSV, using certain RNA interference mediating ribonucleic acid molecules. [0013] Vaillant et al., US 2004/0229828 describe certain antiviral single-stranded oligonucleotides targeting RSV. [0014] Mohapatra et al., WO 05/056021 describe certain siRNA molecules targeting RSV. [0015] Bitco et al., 2005, Nature Medicine, 11, 50-55, describes the use of certain nasally administered vector expressed siRNA constructs targeting RSV. [0016] Zhang et al., 2005, Nature Medicine, 11, 56-62, describes the use of certain nasally administered vector expressed siRNA constructs targeting the N1 gene of RSV. SUMMARY OF THE INVENTION [0017] This invention relates to compounds, compositions, and methods useful for modulating the expression of genes, such as those genes associated with the development or maintenance of RSV infection and other disease states associated with RSV infection (e.g., respiratory distress, bronchiolitis and pneumonia), by RNA interference (RNAi) using short interfering nucleic acid (siNA) molecules. This invention also relates to compounds, compositions, and methods useful for modulating the expression and activity of other genes involved in pathways of RSV gene expression and/or activity by RNA interference (RNAi) using small nucleic acid molecules. In particular, the instant invention features small nucleic acid molecules, such as short interfering nucleic acid (siNA), short interfering RNA (siRNA), double-stranded RNA (dsRNA), micro-RNA (miRNA), and short hairpin RNA (shRNA) molecules and methods used to modulate the expression of RSV genes and/or other genes (e.g., cellular or host genes) involved in pathways of RSV gene expression and/or infection. [0018] A siNA of the invention can be unmodified or chemically-modified. A siNA of the instant invention can be chemically synthesized, expressed from a vector or enzymatically synthesized. The instant invention also features various chemically-modified synthetic short interfering nucleic acid (siNA) molecules capable of modulating target gene expression or activity in cells by RNA interference (RNAi). The use of chemically-modified siNA improves various properties of native siNA molecules through increased resistance to nuclease degradation in vivo and/or through improved cellular uptake. Further, contrary to earlier published studies, siNA having multiple chemical modifications, including fully modified siNA, retains its RNAi activity. The siNA molecules of the instant invention provide useful reagents and methods for a variety of therapeutic, prophylactic, veterinary, diagnostic, target validation, genomic discovery, genetic engineering, and pharmacogenomic applications. [0019] In one embodiment, the invention features one or more siNA molecules and methods that independently or in combination modulate the expression of gene(s) encoding RSV and/or cellular proteins associated with the maintenance or development of RSV infection, respiratory distress, bronchiolitis, and pneumonia, such as genes encoding sequences comprising those sequences referred to by GenBank Accession Nos. shown in Table I, referred to herein generally as RSV. The description below of the various aspects and embodiments of the invention is provided with reference to exemplary respiratory syncytial virus (RSV) genes (e.g., genes encoding RSV proteins such as nucleopretein (N), large (L) and phosphoproteins (P), matrix (M), fusion (F), glycoprotein (G), NS1 and 2 non-structural proteins, including small hydrophobic (SH) and M2 proteins), generally referred to herein as RSV. However, such reference is meant to be exemplary only and the various aspects and embodiments of the invention are also directed to other genes that express alternate RSV genes, such as mutant RSV genes, splice variants of RSV genes, and genes encoding different strains of RSV, as well as as cellular targets for RSV, such as those described herein and also referred to by GenBank Accession Nos. herein and in U.S. Ser. No. 10/923,536 and U.S. Ser. No. 10/923,536, both incorporated by reference herein. The various aspects and embodiments are also directed to other genes involved in RSV pathways, including genes that encode cellular proteins involved in the maintenance and/or development of RSV infection, respiratory distress, bronchiolitis, and pneumonia, or other genes that express other proteins associated with RSV infection, such as cellular proteins that are utilized in the RSV life-cycle. Such additional genes can be analyzed for target sites using the methods described herein for RSV. Thus, the inhibition and the effects of such inhibition of the other genes can be performed as described herein. In other words, the term "RSV" as it is defined herein below and recited in the described embodiments, is meant to encompass genes associated with the development and/or maintenance of RSV infection, such as genes which encode RSV polypeptides, including polypeptides of different strains of RSV, mutant RSV genes, and splice variants of RSV genes, as well as cellular genes involved in RSV pathways of gene expression, replication, and/or RSV activity. Also, the term "RSV" as it is defined herein below and recited in the described embodiments, is meant to encompass RSV viral gene products and cellular gene products involved in RSV infection, such as those described herein. Thus, each of the embodiments described herein with reference to the term "RSV" are applicable to all of the virus, cellular and viral protein, peptide, polypeptide, and/or polynucleotide molecules covered by the term "RSV", as that term is defined herein. Comprehensively, such gene targets are also referred to herein generally as "target" sequences. [0020] In one embodiment, the invention features a composition comprising two or more different siNA molecules of the invention (e.g., siNA, duplex foming siNA, or multifunctional siNA or any combination thereof) targeting different polynucleotide targets, such as different regions of RSV RNA (e.g., two different target sites herein or any combination of RSV proteins such as nucleopretein (N), large (L) and phosphoproteins (P), matrix (M), fusion (F), glycoprotein (G), NS1 and 2 non-structural proteins, including small hydrophobic (SH) and M2 protein targets), different viral strains (e.g., RSV strains, or HIV and RSV, RSV and HCV etc.), or different viral and cellular targets (e.g., a RSV target and a cellular target as described herein). Such pools of siNA molecules can prevent or overcome viral resistance or otherwise provide increased therapeutic effect. [0021] In one embodiment, the invention features a pool of two or more different siNA molcules of the invention (e.g., siNA, duplex foming siNA, or multifunctional siNA or any combination thereof) targeting different polynucleotide targets, such as different regions of RSV RNA (e.g., two different target sites herein or any combination of RSV proteins such as nucleopretein (N), large (L) and phosphoproteins (P), matrix (M), fusion (F), glycoprotein (G), NS1 and 2 non-structural proteins, including small hydrophobic (SH) and M2 protein targets), different viral strains (e.g., RSV strains), or different viruses (e.g., HIV and RSV, RSV and HCV etc.), or different viral and cellular targets (e.g., a RSV target and a cellular target), wherein the pool comprises siNA molecules targeting about 2, 3, 4, 5, 6, 7, 8, 9, 10 or more different RSV targets. 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